S
M
T
W
T
F
S
30
91°
74°
31
93°
75°
1
90°
75°
2
88°
75°
3
88°
73°
4
90°
73°
5
91°
74°
6
93°
73°
7
91°
72°
8
88°
74°
9
89°
70°
10
92°
70°
11
87°
71°
12
86°
71°
13
89°
69°
14
87°
73°
15
90°
73°
16
89°
72°
17
88°
73°
18
86°
73°
19
87°
72°
20
85°
72°
21
85°
71°
22
84°
71°
23
84°
70°
24
85°
71°
25
84°
71°
26
83°
70°
27
85°
71°
28
86°
70°
29
85°
69°
30
84°
70°
1
83°
70°
2
83°
69°
3
82°
69°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Keystone Heights
Keystone Heights's September 2026 forecast shows daily high temperatures ranging from 82° to 93°, with overnight lows between 69° and 75°. The average high for September is 87° with an average low of 72°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Keystone Heights. See also: October | November | December.
